During the course of evolution why DNA w | Class 12 Biology Chapter Molecular Basis of Inheritance, Molecular Basis of Inheritance NCERT Solutions

Question:

During the course of evolution why DNA was chosen over RNA as genetic material? Give reasons by first discussing the desired criteria in a molecule that can act as genetic material and in the light of biochemical differences between DNA and RNA.

Answer:

A molecule that can act as a genetic material must fulfill the following requirements:

  1. It should be able to generate its replica also known as replication.
  2. It should chemically and structurally be stable.
  3. It should provide the scope for slow changes or we can mutations that are required for evolution.
  4. It should be able to represent itself in the form of Mendelian.

Biochemical differences between DNA and RNA:

  1. Both nucleic acid (DNA and RNA) are able to direct their duplication proteins fails for the first criteria.
  2. RNA is reactive, it also acts are catalyst, hence DNA is less reactive and structurally more stable than RNA.
  3. Presence of thymine at the place of uracil also confers additional stability to DNA.


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Welcome to the NCERT Solutions for Class 12 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 2: During the course of evolution why DNA was chosen over RNA as genetic material? Give reasons by firs....

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